Its really hard to say what the best reusables are. Everybody has different needs from nappies. What I did was buy a couple of different sample packs and trial packs, and go from there to choose what I think will be best for me and my baby when he/she arrives. I've still not commited to buying a full birth-to-potty pack, purely bacause of the price, and what if they don't suit us after all? I have instead bought a 'day pack' of my chosen nappy which are tot bots, and once baby is here and I see how we get on with them I will buy the birth-to-potty pack. While I am waiting on this arriving, I have all the other samples etc, and a couple packs of disposables to use. If they turn out not to suit our needs, again I have all the other trial packs that I can try with baby and hopefully find something that suits us!
Sorry I have rambled on a bit, my main point is that I think using reusables will be worth it, but I also think it would be best to try a couple of different brans before you commit to buying a complete pack.

A couple of websites that I found helpful are www.thenappylady.com or .co.uk (maybe best to google the nappy lady for this one)
www.cheeksandcherries.com